PORR ProjectsWorld of PORR 165/2014

Christoph Zieger

General informationCelebrity architect Daniel Libeskind's intention in this projectwas to show his love for the city of Berlin. The result is basedon the concept of a spectacular corner building which issupposed to form the border of Berlin's customary blockstructure in the city's Mitte district.

Porr Deutschland GmbH, Berlin branch, was commissionedwith the turnkey execution of the "Sapphire" constructionscheme in September 2014. Apart from the execution of theconstruction project, the entire execution planning of the HOAI(The Fee Structure for Architects and Engineers) servicephase 5 is also part of the general contractor agreement.

VisualisationImage: pure rendering gmbH

VisualisationImage: pure rendering gmbH

Project data

Client Chausseestraße 43 EntwicklungsGmbH

Contractor Porr Deutschland GmbH, Berlinbranch, Building ConstructionDepartment

Type of project Residential and commercial building

Start of constructionwork

October 2014

End of construction March 2016

Gross floor area(GFA)

approx. 8,000 m²

Flats 72

Commercial units 4

Parking spaces inthe underground carpark

32

LocationThe construction scheme's site is located on the cornerproperty Chausseestraße 43/Schwartzkopffstraße 1, directlyopposite from the building of the German Intelligence Agency(BND) currently under construction.

Project descriptionThe project includes of 72 individual flats (1st to 6th floor),four commercial units on the ground floor and a basementfloor with 32 underground parking spaces and cellar units.

The flats are grouped around an intensively landscaped innercourtyard on the first floor.

A usable community area with playgrounds and fitness roomswill be established in the inner courtyard. The walkways andgreen areas are intended to function as extensions of thebuilding's architectural lines allowing a viewer to immediatelyspot the continuation of the architectural concept in the greenareas.

Construction Scheme "Sapphire-Libeskind"Celebrity architect Daniel Libeskind's first residential and commercial buildingin Berlin

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PORR ProjectsWorld of PORR 165/2014

Visualisation of inner courtyardImage: xoio

Shade calculation inner courtyardImage: PORR AG

The project has been divided into three building elements.Each building element will feature a unique, high-quality foyerwith integrated lift and staircase.

Visualisation of foyerImage: pure rendering gmbH

Modern, open 2 to 3 room flats with upscale equipment and aroom height of 2.80 m offer future residents plenty of freespace. All the buildings' flats feature a loggia, a balcony or aterrace or, when located on the first floor, a piece of gardenfacing the courtyard.

The penthouses equipped with roof terrace, integrated galleryand their own fireplace will be installed on the 6th floor.Ceiling heights of up to 7.50 m are achieved here. In order toguarantee beautiful views of Berlin for all residents, there willbe a community terrace on the roof.

Visualisation of penthouseImage: pure rendering gmbH

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PORR ProjectsWorld of PORR 165/2014

Visualisation of penthouseImage: pure rendering gmbH

Visualisation of penthouseImage: pure rendering gmbH

All flats are equipped with real wood floors. Doors featureblock frames installed flush with the wall executed with acircumferential shadow gap.

Flats furthermore feature floor heating and controlleddomestic ventilation representing the standard when it comesto the flats' technical equipment.

The premium bath rooms feature integrated covered lightingin the ceiling and tiles designed by Daniel Libeskind.

PlanningIn order to capitalise on PORR's internal know-how, PORRDesign & Engineering was commissioned with the LP 5planning of execution (architecture, superstructure

and house technology).

BIM software is used to plan a digital model of the building –from the concept to completion – on the basis of standardisedprocesses. This planning process includes 3D geometry withstandardised parameters, 4D linkage for purposes ofconstruction process planning (time) as well as 5D linkage forpurposes of performance and cost monitoring.

The created 3D model forms the basis for all those involved inthe project – from the architect to the structural engineer tothose responsible for building technology, construction projectpreparation and calculation to the client and those taking careof facility management.

3D-ModellImage: PORR AG

Execution of construction workDuring execution, an economical and practical solution had tobe found for the sloped walls and those walls not positionedat a right angle to one another. The objective was to have theforeman on site execute the planned sloped walls and nothaving a surveyor work on site every day or every hour.

In the end, we managed to find a satisfying solution throughutilising our in-house expertise: The walls were executedusing digital spirit levels and digital bevels. This methodproved very successful in the execution of construction workand still does for it allows keeping the interface to thesurveyor as small as possible.

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PORR ProjectsWorld of PORR 165/2014

Positioning sloped exterior walls' form workImage: PORR AG

Load transfer from the formwork to the scaffoldingImage: PORR AG

Alignment and control of the sloped form workImage: PORR AG

Another core area during execution was selecting a suitablesub-structure or scaffolding system to support the form workof the sloped exterior walls. It was PORR's intention todevelop a system that would additionally replace the façadescaffold.

Together with those involved in the project and the form workmanufacturer, we managed to develop a form workscaffolding system that met all requirements in the form of heavy duty scaffold towers provided by the formwork supplier. The work platforms were established at theheight of each floor slab using form work girders andfloorboards. These served as platforms for

all work to be performed on the exterior façade and madesure that the forces generated during form work installationcould be absorbed professionally and safely.

Heavy-duty scaffold towersImage: PORR AG

Heavy-duty scaffold towersImage: PORR AG

Working level on the form work scaffoldingImage: PORR AG

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PORR ProjectsWorld of PORR 165/2014

Façade materialFor the façade, architect Daniel Libeskind developed tilesreflecting the architectural intention of the entire constructionscheme in collaboration with one of the oldest Italian tilemanufacturer.

The unique tiles measuring 60 cm by 120 cm are 13 mm thickand – thanks to a special ceramics-titanium material –extremely sturdy. In addition, the tiles were coated with a bio-active layer. This layer allows for a self-cleaning effect andconverts the abundant carbon dioxide into oxygen.

In order to secure the construction period and the quality, thematerial was pre-manufactured by the producer by order ofour sub-contractor. The tiles are being delivered to Berlin cutto size, and pre-drilled. They constitute an oversized puzzleallowing for almost no tolerances with regard to the sub-structure.

FaçadeThe main façade extends from Chausseestraße toSchwartzkopffstraße. It was executed as a classic curtainfaçade.

Set-up

Inside out

1. Layer Interior plaster

2. Layer 20 cm reinforced concrete

3. Layer 18 cm mineral wool

4. Layer 3 cm rear ventilation

5. Layer 3 m guiding rails (sub-structure)

6. Layer 1.3 cm tiles

The different slope angles on site created great difficultieswhen installing the tiles. The sub-structure is an agraffesystem and features consoles that are being attached to theshell. Continuous guiding rails are mounted onto theseconsoles and serve as suspension points for the tiles.

In order to attach the tiles to the guiding rails, four cone-shaped undercut anchors with the corresponding counterpiece to the guiding rail are being mounted to the tiles. Inorder to attach the anchors to the tiles, 6 mm wide and 5 mmdeep holes are drilled into the tiles' back. The anchors areplaced in these holes and mounted with the agraffes (counterpieces to the guiding rail).

Thanks to the chosen form work scaffolding, constructionprocesses demand installing the façade (tiles) form top tobottom. This could only be managed through turning theguiding rail system around by 180 degrees. After technicalclarification with the manufacturer, permission for thisexecution method could be obtained.In order to ensure the execution quality of the façade workand to achieve high-quality and professional results, a modelfaçade was manufactured at the construction site. At a size of3.50 m x 7.50 m, the model shows a section of

the real façade. Its construction illustrated the façade'sindividual detailed aspects' complexity and execution featuresthat need to be paid attention to in particular later on duringexecution.

FaçadeImage: PORR AG

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PORR ProjectsWorld of PORR 165/2014

FaçadeImage: PORR AG

FaçadeImage: PORR AG

FaçadeImage: PORR AG

FaçadeImage: PORR AG

Utilising PORR's know-how, we will construct a future-oriented, unique building in Berlin which will open a gate tothe city's centre in a glorious fashion.

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